This is the Octoling I wish would be playable. They were dropped from the original Splatoon. The playable Octolings we eventually did get look completely different from this (I got nothing against them though). When Splatoon 3 comes, they can make this Octoling playable via a special hairstyle from the Octoling girl. They can even make a boy version. Octoling kelp can be a headgear.
Like I said in some previous posts, being playable from the get-go, Splatoon 3 would be the first time Octolings would be playable in Hero Mode. Splatoon 2 Octo Expansion was the first time Octolings were officially playable, and Splatoon 3 can push them even more to the forefront with the Inklings.